He said "rate"...
Although, I have noticed that my 109 rolls very quickly once I lose one of those pesky wings.
I know, why are people talking about 109s and F4Us lol.
The best roll rate planes are the 190s (all of them) the Ki84s and 43, and the spit16. Using the roll rate to change the direction of a loop or climb is very beneficial. In a 190 where the barrel roll is less effective, you have to use the snap roll in the vertical to gain angles. This works a lot better in planes like the Ki84, spit16, and 190D, than the 109s or F4U because the snap roll can change the planes direction much more quickly without giving up E. This can cause planes with slower roll rates to lose E much more quickly ln a verticle situation.